gromacs: add adh_dodec, change nsteps to variable

[danielahlin]

Also remove resethway in favour of resetstep

[danielahlin]

Make the gromacs command, subcommand and most currently used parameters variables:

gmx: Name of the gromacs binary - to be able to support both gmx_mpi (for gromacs+mpi) and gmx (for gromacs~mpi)

grompp: prefix for how to run grompp. This is primarily to be able to use mpirun with -n 1 for mpi builds where applications needs to be run with mpirun even for -n 1

mdrun: Primarily to complement the grompp variable

verbose: To turn on and of verbose mode (it usually has a slight performance impact)

nopmetune: To control the parameter with the same name

dlb: Value for dynamic load balancing (yes or no)

[rfbgo]

Hey Daniel!

PR is looking good, main blocker now is the style. Our report hides the useful bit in the middle, so here it is incase it's useful

Step #1 - "ramble-style-tests": var/ramble/repos/builtin/applications/gromacs/application.py:123: [E124] closing bracket does not match visual indentation
Step #1 - "ramble-style-tests": var/ramble/repos/builtin/applications/gromacs/application.py:127: [E124] closing bracket does not match visual indentation
Step #1 - "ramble-style-tests": var/ramble/repos/builtin/applications/gromacs/application.py:131: [E124] closing bracket does not match visual indentation
Step #1 - "ramble-style-tests": var/ramble/repos/builtin/applications/gromacs/application.py:135: [E124] closing bracket does not match visual indentation
Step #1 - "ramble-style-tests": var/ramble/repos/builtin/applications/gromacs/application.py:139: [E124] closing bracket does not match visual indentation
Step #1 - "ramble-style-tests": var/ramble/repos/builtin/applications/gromacs/application.py:143: [E124] closing bracket does not match visual indentation
Step #1 - "ramble-style-tests": var/ramble/repos/builtin/applications/gromacs/application.py:147: [E124] closing bracket does not match visual indentation
Step #1 - "ramble-style-tests": var/ramble/repos/builtin/applications/gromacs/application.py:151: [E124] closing bracket does not match visual indentation
Step #1 - "ramble-style-tests": 

We value the contribution and are happy to help out with fixing the style stuff, just let us know

[danielahlin]

Thanks for the feedback, hopefully addressed now.

[douglasjacobsen]

One small request, otherwise this LGTM.